Name:
4/15/11
Math 256 Quiz 2
Directions: To receive full credit you must clearly show all your work. Please draw a box around
each of your answers.
1. (4pts) A tank initially contains 300 L of pure water. A mixture containing a concentration
of 10 g/L of

Name:
5/13/11
Math 256 Quiz 4
Directions: To receive full credit you must clearly show all your work. Please draw a box around
each of your answers.
1. Find the general solution of the dierential equation y + 2y 3y = 3e2t .
2. Find the general solution of

Name:
5/20/11
Math 256 Quiz 5
Directions: To receive full credit you must clearly show all your work. Please draw a box around
each of your answers.
1. Find the general solution of the dierential equation y 2y + y = et
2. Is the matrix
21
33
invertible? I